package day220;

import java.util.Locale;
import java.util.Random;

public class VerificationCode {
    public static void main(String[] args) {
        /*
        String code=VerCode(40);
        System.out.println("验证码:"+code);
    }
    public static String VerCode(int len){
        String code="";
        char[] chs={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t'
                ,'u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O'
                ,'P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9'};
        for(int i=1;i<=len;i++){
            int index=(int)(Math.random()*chs.length);
            code+=chs[index];
        }
        return code;
    }

        String code=VerCode(6);
        System.out.println("验证码:"+code);
    }
    public static String VerCode(int len){
        String code="";
        char[] chs={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t'
                ,'u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O'
                ,'P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9'};
        Random rand=new Random();
        for(int i=1;i<=len;i++){
            int index=rand.nextInt(chs.length);
            code+=chs[index];
        }
        return code;
    }

        String code=code(6);
        System.out.println("验证码:"+code);
    }
    public static String code(int len) {
        String code = "";
        char[] chs = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't'
                , 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O'
                , 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
        for (int i = 0; i <len ; i++) {
            int index = (int) (Math.random() * chs.length);
            code+=chs[index];
        }
        return code;
    }

        String code=verCode(6);
        System.out.println("验证码:"+code);
        code=code.toLowerCase(Locale.ROOT);
        System.out.println(code);
    }
    public static String verCode(int len){
        String code="";
        char[] chs={'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't'
                , 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O'
                , 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
        Random rand=new Random();
        for(int i=0;i<len;i++){
            int index=rand.nextInt(chs.length);
            code+=chs[index];
        }
        return code;
    }

         */
        String code=code(6);
        System.out.println("验证码为:"+code);

    }
    public static String code(int lin){
        String s="";
        String str="0123456789abcdefghijklmnopqrstuvwxyz";
        Random rand=new Random();
        for(int i=0;i<lin;i++){
            int index=rand.nextInt(str.length());
            char a=str.charAt(index);
            s+=a;
        }
        return s;
    }





















}
